... tester designed to easily COP (Coil-On-Plug) Ignition System Quick Tester SV750The Coil On Plug (COP) Quick Ignition tester is a ... if a COP is producing a proper spark for the plug.The quick tester works by receiving a signal from the ... may be caused by one of the following:Fouled spark plug, or incorrect gap Damaged/corroded wires or connectors Faulty coil ...